/Engine/Plugins/FX/Niagara/Source/Niagara/Public/NiagaraSystemInstance.h
Gets a multicast delegate which is called after this instance has finished ticking for the frame on the game thread
void SetOnPostTick ( const [FOnPostTick](API\Plugins\Niagara\FNiagaraSystemInstance\FOnPostTick) & InPostTickDelegate )